R2, R02, R.II, R.2 or R-2 may refer to:

Entertainment

* ''

R2 (Rock'n'Reel) ''R2'' is a music magazine A magazine is a periodical publication, generally published on a regular schedule (often weekly or monthly), containing a variety of content. They are generally financed by advertising, purchase price, prepaid subs ...

'', a British music magazine *

R2-D2 R2-D2 () or Artoo-Detoo is a fictional robot character in the ''Star Wars'' franchise created by George Lucas. He has appeared in ten of the eleven theatrical ''Star Wars'' films to date. At various points throughout the course of the films, R2, ...

, a character from ''Star Wars'' films and books, nickname R2 * '' Code Geass: Lelouch of the Rebellion R2'', a 2008 anime series * ''

Resistance 2 ''Resistance 2'' is a 2008 science fiction first-person shooter video game developed by Insomniac Games and published by Sony Computer Entertainment for the PlayStation 3. The game was released in North America on November 4, 2008, in Australia ...

'', a video game * ''

Relapse 2 ''Recovery'' (stylized as ''RECOVƎRY'') is the seventh studio album by American rapper Eminem. It was released on June 18, 2010, by Aftermath Entertainment, Shady Records, and Interscope Records. It serves as a direct follow-up to last year’s ...

'', a 2009 album by rapper Eminem *

Patricio Rey y sus Redonditos de Ricota Patricio Rey y sus Redonditos de Ricota, also known simply as Patricio Rey, Los Redondos or Los Redonditos de Ricota, was a rock band formed in La Plata, Argentina. The group was active from the mid 70s up to the early 2000s. They are known for ...

or R2, an Argentine rock band * Region 2, a

DVD region code DVD region codes are a digital rights management technique introduced in 1997. It is designed to allow rights holders to control the international distribution of a DVD release, including its content, release date, and price, all according to ...

Science and technology

* R² or ''r''² (pronounced R-square), the

coefficient of determination In statistics, the coefficient of determination, denoted ''R''2 or ''r''2 and pronounced "R squared", is the proportion of the variation in the dependent variable that is predictable from the independent variable(s). It is a statistic used ...

of a linear regression in statistics * R², the two-dimensional

real coordinate space In mathematics, the real coordinate space of dimension , denoted ( ) or is the set of the -tuples of real numbers, that is the set of all sequences of real numbers. With component-wise addition and scalar multiplication, it is a real vecto ...

in mathematics * R2: Risk of explosion by shock, friction, fire or other sources of ignition, a risk phrase in chemistry *

R2 RNA element R, or r, is the eighteenth letter of the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide. Its name in English is ''ar'' (pronounced ), plural ''ars'', or in Irela ...

, a cis-acting element identified in R2 retrotransposons which is involved in priming the reverse transcription process *

ATC code R02 R02A Throat preparations R02AA Antiseptics :R02AA01 Ambazone :R02AA02 Dequalinium :R02AA03 Dichlorobenzyl alcohol :R02AA05 Chlorhexidine :R02AA06 Cetylpyridinium :R02AA09 Benzethonium :R02AA10 Myristyl-benzalkonium :R02AA11 Chlorquinaldol :R02 ...

''Throat preparations'', a section of the Anatomical Therapeutic Chemical Classification System *

Haplogroup R2 (Y-DNA) Haplogroup R2, or R-M479, is a Y-chromosome haplogroup characterized by genetic marker M479. It is one of two primary descendants of Haplogroup R (R-M207), the other being R1 (R-M173). R-M479 has been concentrated geographically in South Asia an ...

, a human Y-chromosome haplogroup * ''receptor 2'', the second in line of a series of

cellular receptors In biochemistry and pharmacology, receptors are chemical structures, composed of protein, that receive and transduce signals that may be integrated into biological systems. These signals are typically chemical messengers which bind to a recepto ...

, generally at the end of an acronym *

Gangrene Gangrene is a type of tissue death caused by a lack of blood supply. Symptoms may include a change in skin color to red or black, numbness, swelling, pain, skin breakdown, and coolness. The feet and hands are most commonly affected. If the gan ...

(ICD-10 code) *

Robonaut 2 A robonaut is a humanoid robot, part of a development project conducted by the Dexterous Robotics Laboratory at NASA's Lyndon B. Johnson Space Center (JSC) in Houston, Texas. Robonaut differs from other current space-faring robots in that, while ...

, a NASA humanoid robotic development project *

R2 signalling Signalling System R2 is a signalling protocol for telecommunications that was in use from the 1960s mostly in Europe, and later also in Latin America, Asia, and Australia, to convey exchange information between two telephone switching systems for e ...

, a family of telephony protocols for line and register signalling

Computing

.r02 RAR is a proprietary archive file format that supports data compression, error correction and file spanning. It was developed in 1993 by Russian software engineer Eugene Roshal and the software is licensed by ''win.rar GmbH''. The name ''RAR' ...

, a RAR file extension *

Radare2 Radare2 (also known as r2) is a complete framework for reverse-engineering and analyzing binaries; composed of a set of small utilities that can be used together or independently from the command line. Built around a disassembler for computer so ...

, an open source reverse engineering framework also known as r2

Transportation

R2 (Rodalies de Catalunya) The R2 is a line of Rodalies de Catalunya's Barcelona commuter rail service, operated by Renfe Operadora. It is a major north–south axis in the Barcelona metropolitan area, running from the southern limits of the province of Girona to the nort ...

, a commuter rail line in Barcelona, Catalonia, Spain *

Wilmington/Newark Line The Wilmington/Newark Line is a route of the SEPTA Regional Rail commuter rail system in the Philadelphia area. The line serves southeastern Pennsylvania and northern Delaware, with stations in Marcus Hook, Pennsylvania, Wilmington, Delaware, a ...

(''R2 Wilmington/Newark line'') *

Warminster Line The Warminster Line is a route of the SEPTA Regional Rail commuter rail system. It serves stations between its namesake town, Warminster, and Center City, Philadelphia. Half of the route is shared by other lines, including the Lansdale/Doylestow ...

(''R2 Warminster line'') *

Radial Road 2 Radial Road 2 (R-2), informally known as the R-2 Road, is a network of roads and bridges that all together form the second arterial road of Metro Manila in the Philippines. Spanning some , it connects the cities and municipalities of Bacoor, Dasma ...

or R-2, an arterial road of Manila, Philippines * ''Autopista Radial R-2'', a Spanish radial motorway connecting Madrid to Guadalajara and passing through Alcobendas and connecting to N-320 *

R2 expressway (Slovakia) R2 is an expressway ( sk, rýchlostná cesta) in Slovakia, also nicknamed the "southern highway". It starts near Trenčín and ends near Košice. It goes through or around Bánovce nad Bebravou, Prievidza, Žiar nad Hronom, Zvolen, Lučenec, Rima ...

* Orenburg Airlines (IATA code)

Vehicles

* R2, a sub-class of Group R rally cars *

DFW R.II The DFW R.II was a German bomber aircraft of World War I. It was developed at a request by the ''Luftstreitkräfte'' in spring 1917 after their experience with the R.I had been generally positive, but only two were ever built despite six being o ...

, a 1918 German bomber aircraft * Fiat R.2, a 1919 Italian reconnaissance aircraft * HMS ''Zest'' (R02), a World War II British Royal Navy Z-class destroyer *

Jaguar R2 The Jaguar R2 was the car with which the Jaguar team competed in the Formula One season. It was driven by Eddie Irvine, who was in his second year with the team, and Luciano Burti, who had deputised for Irvine at the 2000 Austrian Grand Prix. ...

, Jaguar Racing's car for the 2001 Formula One season *

Linke-Hofmann R.II The Linke-Hofmann R.II (''Riesenflugzeug'' – "giant aircraft") was a bomber aircraft designed and built in Germany from 1917. Design and development The Linke-Hofmann R.I had disappointing performance and handling, as well as structural we ...

, a World War I German bomber aircraft *

ORA R2 The Ora White Cat also known as the R2 is a battery electric city car produced by the Chinese car manufacturer Great Wall Motors under its electric vehicle brand Ora from 2020. History In June 2019, Ora presented the R2 EV Concept study as a pre ...

, a Chinese electric city car *

Panzer 35(t) The Panzerkampfwagen 35(t), commonly shortened to Panzer 35(t) or abbreviated as Pz.Kpfw. 35(t), was a Czechoslovak-designed light tank used mainly by Nazi Germany during World War II. The letter (t) stood for ''tschechisch'' (German for "Czech ...

, a Czech tank whose Romanian model was known as the R-2. *

Polikarpov R-2 The Airco DH.9A was a British single-engined light bomber designed and first used shortly before the end of the First World War. It was a development of the unsuccessful Airco DH.9 bomber, featuring a strengthened structure and, crucially, repl ...

, a Soviet Union copy of the 1931 British Airco DH.9A light bomber aircraft *

Ross R-2 Ibis The Ross R-2 Ibis was a single seat, mid-wing, gull winged glider that was designed by Harland Ross in about 1938, under a commission from the Soaring Society of America. The sole example was destroyed in 1940.Said, Bob: ''1983 Sailplane Di ...

, a glider *

Subaru R2 The Subaru R2 is a kei car produced and sold in Japan by Fuji Heavy Industries from 2003 to 2010. Its name was inspired by the Subaru R-2, produced from 1969 to 1972. The R2 was discontinued in 2010. Design The R2 was the first production Suba ...

, a 2003 Japanese car * USS ''R-2'' (SS-79), a 1918 R-class coastal and harbor defense submarine of the US Navy

Other uses

BBC Radio 2 BBC Radio 2 is a British national radio station owned and operated by the BBC. It is the most popular station in the United Kingdom with over 15 million weekly listeners. Since launching in 1967, the station broadcasts a wide range of content ...

, a British radio station *

R-2 (missile) The R-2 ( NATO reporting name SS-2 Sibling) was a Soviet short-range ballistic missile developed from and having twice the range as the R-1 missile (itself a copy of the German V-2). Developed from 1946-1951, the R-2 entered service in numbers ...

, an improved version of German V-2 rocket manufactured by the Soviet Union * R2 is a rank of United States

research university A research university or a research-intensive university is a university that is committed to research as a central part of its mission. They are the most important sites at which knowledge production occurs, along with "intergenerational kno ...

in the